- Barite, ground or otherwise treated
- Barium, ground or otherwise treated
- Blast furnace slag
- Clay for petroleum refining, chemically processed
- Clay, ground or otherwise treated
- Desiccants, activated: clay
- Diatomaceous earth, ground or otherwise treated
- Feldspar, ground or otherwise treated
- Filtering clays, treated purchased materials
- Flint, ground or otherwise treated
- Foundry facings, ground or otherwise treated
- Fuller’s earth, ground or otherwise treated
- Graphite, natural: ground, pulverized, refined, or blended
- Kaolin, ground or otherwise treated
- Lead, black (natural graphite): ground, refined, or blended
- Magnesite, crude: ground, calcined, or dead-burned
- Mica, ground or otherwise treated
- Perlite aggregate
- Perlite, expanded
- Plumbago: ground, refined, or blended
- Pulverized earth
- Pumice, ground or otherwise treated
- Pyrophyllite, ground or otherwise treated
- Roofing granules
- Shale, expanded
- Silicon, ultra high purity: treated purchased materials
- Slag, crushed or ground
- Spar, ground or otherwise treated
- Steatite, ground or otherwise treated
- Talc, ground or otherwise treated
- Vermiculite, exfoliated
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